As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT NR 0451 - EN ROUTE TO CLT, THE APU FAILED. THE CAPTAIN COULD NOT RESTART. THE DECISION WAS MADE TO DIVERT TO BWI. MAINTENANCE REPLACED THE APU FUEL SOLENOID VALVE AS A PRECAUTION AND THE FUEL FILTER. OPERATIONS CHECKED GOOD. (M)